$$\left[\begin{matrix} -4 & 6 \\5 & -2 \end{matrix}\right] - \left[\begin{matrix} 3 & -2 \\-4 & 5 \end{matrix}\right]$$
$\left(\begin{matrix}-7&8\\9&-7\end{matrix}\right)$
$$\left(\begin{matrix}-4&6\\5&-2\end{matrix}\right)-\left(\begin{matrix}3&-2\\-4&5\end{matrix}\right)$$
$$\left(\begin{matrix}-4-3&6-\left(-2\right)\\5-\left(-4\right)&-2-5\end{matrix}\right)$$
$$\left(\begin{matrix}-7&6-\left(-2\right)\\5-\left(-4\right)&-2-5\end{matrix}\right)$$
$$\left(\begin{matrix}-7&8\\5-\left(-4\right)&-2-5\end{matrix}\right)$$
$$\left(\begin{matrix}-7&8\\9&-2-5\end{matrix}\right)$$
$$\left(\begin{matrix}-7&8\\9&-7\end{matrix}\right)$$
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$-23$
